Topic 13.6

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Across
  1. 2. The system of the universe in which the planets, including Earth, revolve around the sun
  2. 4. The shape of an ellipse, which is an elongated circle, stretched into an oval
  3. 7. The first European to make regular observations of the heavens using a telescope; this person made a series of remarkable discoveries: mountains on Earth's moon, four moons revolving around Jupiter, and sunspots
  4. 8. Any of the concentric, revolving, spherical transparent shells in which, according to ancient astronomy, the stars, sun, planets, and moon are set
  5. 9. A person who studies and tries to explain the world; a scholar or a thinker
  6. 10. A system of planetary motion in which the sun, moon, and other planets revolve around Earth
Down
  1. 1. A systematic procedure for collecting and analyzing evidence that was crucial to the evolution of science in the modern world
  2. 3. A system of thought expounded by René Descartes based on the belief that reason is the chief source of knowledge
  3. 5. Born in England in 1642; is often considered the greatest genius of the Scientific Revolution
  4. 6. The theory that says knowledge is achieved through observation